/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.catalina.tribes;

import org.apache.catalina.tribes.util.Arrays;

import java.io.Serializable;

/**
 * <p>Title: Represents a globally unique Id</p>
 * <p>
 * <p>Company: </p>
 *
 * @author Filip Hanik
 * @version 1.0
 */
public final class UniqueId implements Serializable {
	private static final long serialVersionUID = 1L;

	byte[] id;

	public UniqueId() {
	}

	public UniqueId(byte[] id) {
		this.id = id;
	}

	public UniqueId(byte[] id, int offset, int length) {
		this.id = new byte[length];
		System.arraycopy(id, offset, this.id, 0, length);
	}

	@Override
	public int hashCode() {
		if (id == null) return 0;
		return Arrays.hashCode(id);
	}

	@Override
	public boolean equals(Object other) {
		boolean result = (other instanceof UniqueId);
		if (result) {
			UniqueId uid = (UniqueId) other;
			if (this.id == null && uid.id == null) result = true;
			else if (this.id == null && uid.id != null) result = false;
			else if (this.id != null && uid.id == null) result = false;
			else result = Arrays.equals(this.id, uid.id);
		}//end if
		return result;
	}

	public byte[] getBytes() {
		return id;
	}

	@Override
	public String toString() {
		StringBuilder buf = new StringBuilder("UniqueId");
		buf.append(Arrays.toString(id));
		return buf.toString();
	}

}